:root {
    --ios-blue: #007AFF;
    --ios-blue-dark: #0056CC;
    --ios-green: #34C759;
    --ios-red: #FF3B30;
    --ios-orange: #FF9500;
    --ios-gray-light: #F2F2F7;
    --ios-gray-medium: #C7C7CC;
    --ios-gray-dark: #8E8E93;
    --ios-black: #1D1D1F;
    --ios-white: #FFFFFF;
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.16);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
    font-size: 17px;
    line-height: 1.5;
    color: var(--ios-black);
    background-color: var(--ios-gray-light);
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 15px 0;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.apple-logo {
    color: var(--ios-black);
}

.nav-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--ios-black);
}

/* Hero Section */
.hero {
    padding: 60px 0 40px;
    text-align: center;
    background: linear-gradient(135deg, #F5F5F7 0%, #FFFFFF 100%);
}

.hero h1 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--ios-black);
}

.hero p {
    font-size: 19px;
    color: var(--ios-gray-dark);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.install-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    max-width: 900px;
    margin: 0 auto 40px;
}

.install-box {
    background-color: var(--ios-white);
    border-radius: var(--border-radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0,0,0,0.05);
    text-align: center;
}

.install-box.secondary {
    background-color: var(--ios-gray-light);
    border: 1px solid var(--ios-gray-medium);
}

.install-box h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 25px;
    color: var(--ios-black);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.install-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 18px 30px;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    width: 100%;
    border: none;
    cursor: pointer;
    margin-bottom: 15px;
}

.install-btn.primary {
    background-color: var(--ios-blue);
    color: var(--ios-white);
}

.install-btn.primary:hover {
    background-color: var(--ios-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.25);
}

.install-btn:not(.primary) {
    background-color: var(--ios-white);
    color: var(--ios-black);
    border: 2px solid var(--ios-gray-medium);
}

.install-btn:not(.primary):hover {
    background-color: var(--ios-gray-light);
    transform: translateY(-2px);
}

.install-note {
    color: var(--ios-gray-dark);
    font-size: 14px;
    line-height: 1.4;
}

.compatibility {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
    margin-top: 30px;
}

.compat-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--ios-gray-dark);
    font-size: 15px;
    padding: 8px 16px;
    background-color: rgba(0,0,0,0.03);
    border-radius: 20px;
}

.compat-item i {
    color: var(--ios-green);
}

/* Instructions */
.instructions {
    padding: 60px 0;
    background-color: var(--ios-white);
}

.instructions h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 40px;
    text-align: center;
    color: var(--ios-black);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    text-align: center;
    padding: 25px;
    background-color: var(--ios-gray-light);
    border-radius: var(--border-radius-lg);
    transition: transform 0.3s ease;
}

.step:hover {
    transform: translateY(-5px);
    background-color: #E5E5EA;
}

.step-number {
    width: 50px;
    height: 50px;
    background-color: var(--ios-blue);
    color: var(--ios-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--ios-black);
}

.step-content p {
    color: var(--ios-gray-dark);
    font-size: 16px;
    line-height: 1.5;
}

/* Screenshots */
.screenshots {
    padding: 60px 0;
    background-color: var(--ios-gray-light);
    text-align: center;
}

.screenshots h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--ios-black);
}

.screenshots > .container > p {
    color: var(--ios-gray-dark);
    font-size: 19px;
    margin-bottom: 40px;
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.screenshot-item {
    text-align: center;
}

.device-frame {
    background-color: var(--ios-black);
    border-radius: 40px;
    padding: 20px;
    margin-bottom: 20px;
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.device-top {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.camera {
    width: 12px;
    height: 12px;
    background-color: #333;
    border-radius: 50%;
}

.speaker {
    width: 60px;
    height: 6px;
    background-color: #222;
    border-radius: 3px;
}

.screen-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
    border-radius: 24px;
    background-color: var(--ios-white);
    display: block;
}

.device-bottom {
    position: absolute;
    bottom: 10px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
}

.home-indicator {
    width: 120px;
    height: 4px;
    background-color: rgba(255,255,255,0.2);
    border-radius: 2px;
}

.caption {
    text-align: center;
}

.caption-step {
    display: inline-block;
    background-color: var(--ios-blue);
    color: var(--ios-white);
    padding: 6px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 8px;
}

.caption p {
    color: var(--ios-gray-dark);
    font-size: 16px;
    margin-top: 5px;
}

/* Info Section */
.info {
    padding: 60px 0;
    background-color: var(--ios-white);
}

.info-card {
    background-color: var(--ios-gray-light);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.info-card h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 30px;
    color: var(--ios-black);
    display: flex;
    align-items: center;
    gap: 12px;
}

.info-card h3 i {
    color: var(--ios-blue);
}

.info-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 25px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.info-icon {
    width: 50px;
    height: 50px;
    background-color: var(--ios-blue);
    color: var(--ios-white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.info-text h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--ios-black);
}

.info-text p {
    color: var(--ios-gray-dark);
    font-size: 15px;
    line-height: 1.5;
}

/* Verification */
.verification {
    padding: 60px 0;
    background-color: var(--ios-gray-light);
    text-align: center;
}

.verification h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 40px;
    color: var(--ios-black);
}

.verify-steps {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.verify-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    min-width: 120px;
}

.verify-step i {
    font-size: 28px;
    color: var(--ios-blue);
}

.verify-step p {
    color: var(--ios-gray-dark);
    font-size: 16px;
}

.verify-step p strong {
    color: var(--ios-black);
    font-weight: 600;
}

.result-box {
    background-color: var(--ios-white);
    border-radius: var(--border-radius-lg);
    padding: 30px;
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 20px;
    box-shadow: var(--shadow-sm);
}

.result-icon {
    width: 60px;
    height: 60px;
    background-color: var(--ios-green);
    color: var(--ios-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.result-text h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--ios-black);
}

.result-text p {
    color: var(--ios-gray-dark);
    font-size: 16px;
    line-height: 1.5;
}

/* Troubleshooting */
.troubleshooting {
    padding: 60px 0;
    background-color: var(--ios-white);
}

.trouble-box {
    background-color: var(--ios-gray-light);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.trouble-box h3 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 30px;
    color: var(--ios-black);
    display: flex;
    align-items: center;
    gap: 12px;
}

.trouble-box h3 i {
    color: var(--ios-orange);
}

.trouble-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 25px;
}

.trouble-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    background-color: var(--ios-white);
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--ios-gray-medium);
}

.trouble-item i {
    font-size: 24px;
    color: var(--ios-orange);
    margin-top: 3px;
    flex-shrink: 0;
}

.trouble-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--ios-black);
}

.trouble-item p {
    color: var(--ios-gray-dark);
    font-size: 14px;
    line-height: 1.5;
}

/* Footer */
footer {
    background-color: var(--ios-black);
    color: var(--ios-white);
    padding: 50px 0 30px;
}

.footer-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 25px;
}

.footer-brand i {
    font-size: 24px;
}

.footer-info p {
    color: rgba(255,255,255,0.7);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 10px;
}

.footer-links {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: var(--ios-white);
}

.footer-link i {
    font-size: 12px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }
    
    .hero p {
        font-size: 17px;
    }
    
    .install-options {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .instructions h2,
    .screenshots h2,
    .verification h2 {
        font-size: 28px;
    }
    
    .steps {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .screenshot-grid {
        grid-template-columns: 1fr;
    }
    
    .screen-image {
        height: 300px;
    }
    
    .verify-steps {
        flex-direction: column;
        gap: 15px;
    }
    
    .verify-step {
        min-width: auto;
    }
    
    .info-items,
    .trouble-items {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 26px;
    }
    
    .install-box {
        padding: 25px 15px;
    }
    
    .install-btn {
        padding: 16px 20px;
        font-size: 16px;
    }
    
    .compatibility {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
    
    .device-frame {
        padding: 15px;
        border-radius: 30px;
    }
    
    .screen-image {
        height: 250px;
    }
    
    .info-card,
    .trouble-box {
        padding: 25px 20px;
    }
    
    .result-box {
        flex-direction: column;
        text-align: center;
        padding: 25px 20px;
    }
}